Question

A boy met with a severe accident and there was a fracture in the shaft of a long bone. What do you think is a reason for this?
A. Break in the epiphysis
B. Break in the metaphysis
C. Break in the diaphysis
D. Break in the mesenchyme

Answer 1

A bone is a connective tissue which helps form a skeleton. It is hard and depends on the characteristic hardness and its functions. A bone fracture is a crack in the bone. The type of fractures is defined based on the part of bone cracked. For instance long bones consist of two major structural parts - the diaphysis and the epiphysis and fractures associated with each part are differently classified.

Complete answer:
Option A: The epiphysis of a long bone forms the distal and proximal ends of a long bone. A fracture in the shaft would thus not cause the break in the epiphysis.
Option A is incorrect.
Option B: The metaphysis of a long bone is the part where the epiphysis meets the diaphysis. Thus, any fracture in the shaft cannot be associated with the break in the metaphysic.
Option B is incorrect.
Option C: The diaphysis of long bone is the part which forms the shaft of the bone. It is a hollow tubular shaft which runs between the proximal and the distal ends of the long bone. A fracture in the shaft of the long bone would be associated with a crack or break in the diaphysis.
Option C is therefore correct.
Option D: Mesenchyme is a type of animal tissue composed of loose cells embedded in a mesh of proteins and fluid. So, it is not associated with bone fracture.
Option D is incorrect.

Hence, Option C. is the correct answer.

Note:
A long bone has fundamental regions: the diaphysis and the epiphysis. The diaphysis is the hollow, tubular shaft that runs among the proximal and distal ends of the bone. Inside the diaphysis is the medullary cavity, which is full of yellow bone marrow in an adult. The outer partitions of the diaphysis (cortex, cortical bone) are composed of dense and difficult compact bone, a shape of osseous tissue. The wider segment at every end of the bone is referred to as the epiphysis (plural epiphyses), stuffed internally with spongy bone, some other sort of osseous tissue. Red bone marrow fills the areas among the spongy bone in a few lengthy bones.